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The Dungannon Crown Court, sitting in Belfast's Laganside Courthouse, heard Sean Hackett said he felt "powerful" and "excited" when he was shooting his father and that he "wasn't going to stop until he (Aloysius) was dead".

The judge said that Aloysius Hackett did not die immediately and that "his terror is not hard to imagine" in a fatal attack which was carried out after "considerable planning and preparation in advance" by his youngest child.

Sean Hackett will serve a minimum of ten years before he is considered eligible for release by the Parole Commissioners.

He was given a life sentence with a minimum sentence of ten years on a charge of manslaughter, with a concurrent life sentence with a minimum term of four years for possessing a firearm and ammunition with intent.

Mr Justice Stephens also sentenced Hackett's 18-year-old friend Ronan Mulrine from Dunroe Road, Augher, to one year's detention, suspended for two years, after he admitted supplying his father's .22 Czech hunting rifle and ammunition, unaware they would be used in the killing.

Sean Hackett was acquitted of murder on the grounds of diminished responsibility.